JP4788872B2 - Crime prevention hinge - Google Patents

Description

  The present invention relates to a crime prevention hinge, and more particularly to a crime prevention hinge that can prevent unauthorized unlocking by cutting the hinge shaft.

  The present applicant has previously proposed a novel anti-seismic hinge that can be opened and evacuated even if the door frame is deformed into a rhombus due to an earthquake, and is currently in practical use.

As shown in FIG. 1, the anti-seismic hinge includes a first vane plate 2 having a support shaft 1 integrally projecting from a side edge and a guide cylinder 3 integrally connected to the side edge. In a hinge having a second blade 4 fitted to the shaft 1, a load plug 5 that abuts against the tip of the support shaft 1 is slidably disposed in the guide tube 3. A locking portion 6 is formed to prevent the shaft from being pulled out to the support shaft 1 side. On the other hand, a compression coil spring 7 is mounted in the guide tube 3 on the side opposite to the support shaft 1 with respect to the load plug 5 to load the load plug. 5 is pressed against the locking portion 6 so that the axial load of the support shaft 1 is carried by the compression coil spring 7 via the load plug 5.
Japanese Patent Publication No. 2-29832

  The anti-seismic hinge having the above-described configuration is configured such that the cylindrical portion that holds the support shaft 1 of the first blade 2 and the guide tube 3 are exposed to the external space, and the thin cylindrical cover body 8 is removed to remove the support shaft 1. A portion between the first and second blades 2 and 4 is exposed.

  Therefore, the exposed portion of the spindle 1 can be cut with a gold saw, file, electric gold saw, grinder, etc. In this case, the door can be removed without unlocking the cylinder lock, There's a problem.

  Of course, there is no conventional example of unauthorized unlocking by cutting the hinge shaft, and since it is inevitable that noise will be generated at the time of cutting, it is extremely unlikely that such unauthorized unlocking will actually occur in the future. .

  However, since there is a theoretical possibility, the applicant as a security device manufacturer has an obligation to propose a hinge that can prevent such unauthorized unlocking.

  Accordingly, an object of the present invention is to provide a crime prevention hinge in which it is difficult to cut the hinge shaft.

In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that the first blade plate screwed to the support side edge of the door and one of the door frames, and the second blade plate screwed to the other. And having a hinge hinge made of metal that guides the vane so that it can rotate around the vertical axis, the hinge axis is divided into two parts on the upper and lower sides by the dividing surface. Of the two hinge shafts, a storage hole is formed along the central axis of the upper long hinge shaft extending between the first and second blades, and at least the surface of the storage hole is formed on the storage shaft. It is characterized by containing a cured reinforcing material.

  In the crime prevention hinge according to the first aspect of the present invention configured as described above, the tool always comes into contact with the reinforcing material in the process of cutting the hinge shaft. Therefore, cutting and grinding for this purpose become impossible, and eventually the hinge shaft can be prevented from being cut.

  Moreover, since the reinforcing material having a hardened surface is embedded in the hinge shaft, various effects such as prevention of material weakening due to quenching or the like of the hinge shaft itself can be achieved.

  By simply embedding a reinforcing material having a hardened surface on the hinge shaft of the hinge, it is possible to prevent unauthorized unlocking by cutting the hinge shaft without increasing the processing cost and changing the structure.

An embodiment of the present invention will be described below with reference to FIG.
In FIG. 1, reference numeral 1 denotes a hinge shaft, and the hinge shaft 1 is divided into two vertically by a dividing surface 9.

  The hinge shaft 1 is expressed as a support shaft in the background art section described above, but it guides the hinge shaft so that the first and second blades can be independently rotated around the vertical axis. At the same time, the load of the door is carried.

  However, in the so-called 5-tube hinge described later, the hinge shaft does not carry the load of the door, but only guides the blades. It will be called a hinge shaft.

  Returning to FIG. 1, a storage hole 11 that covers at least a portion of the cover body 8 is formed along the central axis of the longer hinge shaft among the two hinge shafts divided above, For example, a reinforcing member 12 having a circular cross section is accommodated and embedded in the accommodation hole 11.

  It is clear that the function of the anti-seismic hinge is not impaired by the embedding of the reinforcing material.

  The reinforcing material 12 is made of, for example, hardened high carbon steel to harden the surface as well as the inside.

  Alternatively, only the surface may be hardened by induction hardening, or the surface of the reinforcing material 12 is hardened by carburizing or nitriding the surface of the low carbon steel and further quenching.

  Alternatively, the reinforcing material may be made of a so-called cemented carbide obtained by sintering a carbide of a group IVa, Va, or VIa metal with an iron-based metal such as iron, cobalt, or nickel.

The crime prevention hinge configured as described above exhibits extremely high resistance to the cutting tool, and as described above, the crime prevention performance of the hinge is improved by giving up cutting of the hinge shaft.

  Needless to say, the present invention is not limited to the so-called anti-seismic hinge shown in FIG. The flag hinge means that the compression coil spring 7 is removed from the anti-seismic hinge shown in FIG. 1 so that the load of the door is directly carried on the guide cylinder 3 and the distance between the first and second blades 2 and 4 is. Is made smaller.

  In this case, the reinforcing material can be embedded as in the so-called anti-seismic hinge shown in FIG.

  In the case of flag hinges, the hinge shaft is not exposed to the outside, and if you try to cut it, you must also cut the cylindrical part that is integral with the slats. Ability is high.

The present invention can also be applied to other types of hinges such as a 5-tube hinge.
Here, the five-tube hinge is a plurality of hinge shafts (for example, three for the first blade and two for the second blade) at regular intervals on the side edges of the first and second blades. A holding cylinder is formed, and a cylindrical portion through which the hinge shaft can be inserted is formed by engaging these hinge shaft holding cylinders with each other (not shown).

  In this case, since there is a retaining flange at both ends of the hinge shaft, for example, the reinforcing material storage holes pass through the flange portions at both ends and both ends open, and the reinforcing material is press-fitted into the storage holes.

  The five-tube hinge supports the door load at the junction of the hinge shaft holding cylinder, so that the hinge shaft does not need to carry the door load.

  Also, in the 5-tube hinge, the hinge shaft is not exposed to the outside, and if you try to cut it, you must also cut the hinge shaft holding cylinder that is integral with the slats. Has high cutting ability.

The longitudinal cross-sectional view of the principal part of the crime prevention hinge by one Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Support shaft 2 1st blade 3 Guide tube 4 2nd blade 5 Load plug 6 Locking part 7 Compression coil spring 8 Cover body 9 Dividing surface 11 Storage hole 12 Reinforcement material

Claims (1)

The first slat that is screwed to the edge on the support side of the door and one of the door frames and the second slat that is screwed to the other are connected to each other, and the slat rotates around the vertical axis. In one having a metal hinge shaft that is guided so as to be movable, the hinge shaft is divided into two vertically by a dividing surface, and the space between the first and second blades is divided between the two hinge shafts divided. A crime prevention hinge characterized in that a storage hole is formed along a central axis of an upper long hinge shaft extending over the storage shaft, and a reinforcing material having at least a surface cured is stored in the storage hole .

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